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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | Changes in the carrying amount of goodwill during the years ended December 31, 2018 and 2017 were as follows:
| Community Banks |  | Insurance |  | Total
Balance at December 31, 2016 | $ | 467,767 |  |  | $ | 2,767 |  |  | $ | 470,534 |
Addition to goodwill from Metropolitan acquisition | 140,512 |  |  | — |  |  | 140,512 |
Balance at December 31, 2017 | $ | 608,279 |  |  | $ | 2,767 |  |  | $ | 611,046 |
Addition to goodwill from Brand acquisition | 321,882 |  |  | — |  |  | 321,882 |
Balance at December 31, 2018 | $ | 930,161 |  |  | $ | 2,767 |  |  | $ | 932,928 |
Summary of finite-lived intangible assets | The following table provides a summary of finite-lived intangible assets as of the dates presented:
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
December 31, 2018 |  |  |  |  |
Core deposit intangible | $ | 82,492 |  |  | $ | (38,634 | ) |  | $ | 43,858 |
Customer relationship intangible | 1,970 |  |  | (963 | ) |  | 1,007 |
Total finite-lived intangible assets | $ | 84,462 |  |  | $ | (39,597 | ) |  | $ | 44,865 |
December 31, 2017 |  |  |  |  |
Core deposit intangible | $ | 54,958 |  |  | $ | (31,586 | ) |  | $ | 23,372 |
Customer relationship intangible | 1,970 |  |  | (832 | ) |  | 1,138 |
Total finite-lived intangible assets | $ | 56,928 |  |  | $ | (32,418 | ) |  | $ | 24,510 |
Estimated amortization expense of finite-lived intangible assets for future periods | The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
| Core Deposit Intangibles |  | Customer Relationship Intangible |  | Total
2019 | $ | 7,965 |  |  | $ | 131 |  |  | $ | 8,096 |
2020 | 6,939 |  |  | 131 |  |  | 7,070 |
2021 | 5,860 |  |  | 131 |  |  | 5,991 |
2022 | 4,940 |  |  | 131 |  |  | 5,071 |
2023 | 4,044 |  |  | 131 |  |  | 4,175 |

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